How to get first record of the data source in event handler(Dynamics 365)? #dynamics #ax #d365

Here I'm showing how can we get the first record of the data source and get the next records by looping or by some condition.

Only for reference, TempTable is the data source. 

public static void OKButton_OnClicking(FormControl sender, FormControlEventArgs e)

{

FormRun             formRun         = sender.formRun();

FormDataSource tempTable_ds  = formRun.dataSource(formDataSourceStr(JmgProductionFloorExecution, TempTable));

TempTable  tempTable           =  tempTable_ds.getFirst();

TempTable  tempTableBuffer;

 while(tempTable)

{

tempTableBuffer.FieldOne = tempTable.FieldOne;

tempTableBuffer.FieldTwo   = tempTable.FieldTwo;

tempTableBuffer.insert();

tempTable  =  tempTable_ds.getNext();

}

}